<select id="videoSource">
  <select id="audioSource">
    <video ng-init="$ctrl.init()"></video>
    <a class="btn btn-success" ng-show="!isPlayed" ng-click="$ctrl.play()"
      >Call</a
    >
    <a class="btn btn-danger" ng-show="isPlayed" ng-click="$ctrl.stop()"
      >Stop</a
    >
  </select>
</select>
